Lachen is first mentioned around 1217–22 as de Lachun.
Geography
Lachen has an area of, as of 2006. Of this area, 26.7% is used for agricultural purposes, while 5.8% is forested. Of the remaining land, 62.1% is settled and the remainder is non-productive. The municipality is located on a delta of the Wägi river in the upper section of Lake Zurich. It is the smallest municipality in the Canton of Schwyz.
Demographics
Lachen has a population of., 27.2% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 14.1%. The majority of the population speaks German, followed by Italian and Albanian. the gender distribution of the population was 49.1% male and 50.9% female. 1293 people or 20.6% of the population is under 19. 1950 people or 31.1% are 20 to 39, and 2,055 people or 32.8% are 40 to 64. 489 people or 7.8% are 65 to 74. There are 347 people or 5.5% who are 70 to 79 and 138 people or 2.20% of the population who are over 80. There is one person in Lachen who is over 100 years old. there are 2,817 households, of which 1,039 households contain only one person. 115 or about 4.1% are large households, with at least five occupants. In the 2007 election the most popular party was the SVP which received 43.2% of the vote. The next three most popular parties were the FDP, the SPS and the CVP. In Lachen about 69.2% of the adult population have completed either non-mandatory upper secondary education or additional higher education. Lachen has an unemployment rate of 1.98%., there were 61 people employed in the primary economic sector and about 7 businesses involved in this sector. 859 people are employed in the secondary sector and there are 84 businesses in this sector. 2,686 people are employed in the tertiary sector, with 370 businesses in this sector. According to the, 4,141 or 66.0% of the population are Roman Catholic, while 984 or 15.7% belonged to the Swiss Reformed Church. Of the rest of the population, there are 179 individuals who belong to the Orthodox Church, and there are less than 5 individuals who belong to another Christian church. There are less than 5 individuals who are Jewish, and 413 who are Muslim. There are 38 individuals who belong to another church, 336 are agnostic or atheist, and 178 individuals did not answer the question. The historic population is given in the following table:
year
population
1850
1,506
1900
1,971
1950
3,458
1970
4,914
1980
5,456
1990
5,995
2000
6,317
2005
6,765
2007
6,977
Weather
Lachen has an average of 149.1 days of rain per year and receives on average of precipitation. The wettest month is August during which time Lachen receives an average of of precipitation. During this month there is precipitation for an average of 14.2 days. The month with the most days of precipitation is May, with an average of 14.7, but with only of precipitation. The driest month of the year is January with an average of of precipitation over 14.2 days.
